.testimg{
  position: relative;
  margin-left: 2.5rem;
  width: 5rem;
  height: auto;
}
.testimg img{
  width: 100%;
}

.forchange{
    margin-top:1rem;
    width: 5rem;
    height: 1rem;
    margin-left: 2.5rem;
    background-color: red;
    border-radius: 0.2rem;
}
.forchange span{
  width: 100%;
  height: 100%;
  line-height: 1rem;/*字体上下居中*/
  text-align: center;
}

.index{
  width: 1rem;
  height: 2.4rem;
}